8 month old battery degradation

[AlanSubie4Life]

this from screen km and percentage

So that's 493km, or 306 miles.

You don't show the 291 or what mode the energy screen is in. But anyway, you don't need to. I guess providing it would allow us to calculate the energy or the constant, though.

As mentioned you need to know the EPA range of your car. Since you have a MIC Model Y, I have no idea what that is, and it's probably not the US 330 miles (I don't keep track of this stuff). It is possible to determine - you just have to know what the maximum displayed range was when the car was new (ideally from a selection of like vehicles). Or find the actual correct info somewhere.

 

[teslexus]

This avg. Number 174 doesn't change if we select instant or average range.

Only number that is changing is on right side projected range.

And if we select instant range will show 215 km

And if we select average range will show 261 km

So why any of those numbers 215 or 261 doesnt match with top screen predicted range which is showing now 290km.
???

 

[teslexus]

So that's 493km, or 306 miles.

You don't show the 291 or what mode the energy screen is in. But anyway, you don't need to. I guess providing it would allow us to calculate the energy or the constant, though.

As mentioned you need to know the EPA range of your car. Since you have a MIC Model Y, I have no idea what that is, and it's probably not the US 330 miles (I don't keep track of this stuff). It is possible to determine - you just have to know what the maximum displayed range was when the car was new (ideally from a selection of like vehicles). Or find the actual correct info somewhere.

Max range from new was at 100% = 497 km
2023 MYLR

 

[AlanSubie4Life]

This avg. Number 174 doesn't change if we select instant or average range.

Only number that is changing is on right side projected range.

And if we select instant range will show 215 km

And if we select average range will show 261 km

Yeah, that's my point. Anyway you are using the wrong number, that is the reason - you were in average mode but you used 291km, the displayed current rated range, which is wrong. That's the wrong math.

174x291x100/59=85.82 watt hour

This should be 174Wh/km*261km/0.59 = 76.8kWh.

306mi or 493km

That seems fine regardless of which pack the car started with. Either started with ~78-79kWh or 81-82kWh. (I have no idea which.)

The constant being used to display your range is 174Wh/km*261km/291km= 156Wh/km (~251Wh/mi). (That's where the 291km is useful, it allows you to figure out the constant. But it's not needed for pure energy calculations.)

Just use the method if in doubt.

 

[AAKEE]

not sure if it is panasonic but it is made in china gigafactory

Canadian car, China built?

All Y here in EU is ~531km (330mi) at full range, which includes the LG pack when it reaches the maximum.

Initial range is often lower as the LG starts low sccording to the BMS.

 

[boulder.dude]

Canadian car, China built?

All Y here in EU is ~531km (330mi) at full range, which includes the LG pack when it reaches the maximum.

Initial range is often lower as the LG starts low sccording to the BMS.

Since you’re in EU is the quoted range above WLTP or EPA? Canada might use the latter?

 

[AAKEE]

Since you’re in EU is the quoted range above WLTP or EPA? Canada might use the latter?

The car always shows the EPA equivalent, even in WLTP-land.
(WLTP is never displayed).

 

[teslexus]

did more research and came up across high voltage controller in service menu.
ping HVbms
ping HVP
reset HVP
hvp-LV power test
hvp-PCS interface test



did anyone try to do any reset here and what is this good for ?

 

[teslexus]

i found on internet one more formula we can check lost range.
top right corner showing 342 km range or 70%
original state of charge wen brand new was 597 km or 100 %

now formula is [ 70%= 0.7 ]

342 / 0.7 = 488.571 (342 km divided by 0.7 percentage of battery )

488.571 / 497= 0.9830 (result we devided by original range when car is new 497 km range )

0.9830 x 100 = 98.3 % new capacity

100 - 98.3 = 1.7 % Total degradation of battery



i hope this makes some results we can use...

 

[AAKEE]

i found on internet one more formula we can check lost range.
top right corner showing 342 km range or 70%
original state of charge wen brand new was 597 km or 100 %

now formula is [ 70%= 0.7 ]

342 / 0.7 = 488.571 (342 km divided by 0.7 percentage of battery )

488.571 / 497= 0.9830 (result we devided by original range when car is new 497 km range )

One issue is to know the original (full) range. Just grabbing a number someone remembers might make it wrong.


As there is a overhead before the range starts to drop you need to know that and apply the overhead to your calculation.

0.9830 x 100 = 98.3 % new capacity

100 - 98.3 = 1.7 % Total degradation of battery



i hope this makes some results we can use...

We know the initial capacity of most Teslas.

We can use the energy graph to calculate the capacity.

 

[teslexus]

the funny part i did check on multiple 2023 models including demo models
and all of them will display at 100% only max range of 497 km.

so in my case i am using this 497 km as reference point but you are right real number for the range when car is new we dont know ,because of software limitation on battery range.

i think software limitation of the actual max range is there just to prolong life of out battery.

also i dont know why is big secret for tesla to tell us what is original range of model Y LR .

just for us all to monitor degradation of our battery

 

[AAKEE]

the funny part i did check on multiple 2023 models including demo models
and all of them will display at 100% only max range of 497 km.

so in my case i am using this 497 km as reference point but you are right real number for the range when car is new we dont know ,because of software limitation on battery range.

i think software limitation of the actual max range is there just to prolong life of out battery.

also i dont know why is big secret for tesla to tell us what is original range of model Y LR .

just for us all to monitor degradation of our battery

Perform the enegy graf calculation instead of the miles thing. (Info about that early in hte thread)

 

[teslexus]

i will try energy graph again to use ,

interesting thing was yesterday on supercharger max range from 497 km dropped down to 488 km in less than 10 days observation.

looks like rapid degradation.

 

[AAKEE]

i will try energy graph again to use ,

interesting thing was yesterday on supercharger max range from 497 km dropped down to 488 km in less than 10 days observation.

looks like rapid degradation.

There’s most certainly not any issue about a rapid degradation.
But the BMS varies the estimate a bit up and down.
And we can not safely compare a calculated range (displayed range/ SOC) as SOC is roundedwich means several km from the rounding error.

 

[teslexus]

here is still about same
186 average x 329 km x 100 / 80 [%] = 76.492 watt hours

only projected max range what was creating anxiety from 497 km down to 488 km

but testing real millage only 75 km distance used 18 % of battery @ highway speed of 102 km/ h
no wind and no rain at 22 deg. celsius outdoor temp. ,climate control set on auto at 21 deg inside car , locked on autopilot not heavy traffic

if you do quick calculation range will be {real range } 375 km - 382 km
that is way less than 497 km advertised or 530 km in less than 1 year.

 

[boulder.dude]

if you do quick calculation range will be {real range } 375 km - 382 km
that is way less than 497 km advertised or 530 km in less than 1 year.

Surprise! Teslas don’t get their advertised range in most conditions. That’s due to marketing, not degradation.

 

[teslexus]

just came from service centre now ,did some TPMS home work and just to let you know aftermarket
sensors has sometimes bad batery,

anyway here is 2024 mode Y RWD

393 x 142 x 100 / 72.com = 77.5 watt /hour

brand new about 50 km on screen
that is good reference point.

i agree with false range advertising just to sell product .

 

[teslexus]

Here is model Y LR that calculations are made of.

 

[teslexus]

So if brand new got
393 × 143 x100 /73 = 76.984 Watt/h


The range will be between:
77.5 - 76.98 Watt/hour capacity
And my tesla Y LR got
76.5 Watt/hour after 1 year

this is very low loss in 1 year regarding degradation.

I am still wondering if tesla projected range software need to be recalibrated or I am missing something else.

 

[hybridbear]

I'm shocked at how fast our 2024 Model Y Long Range is losing capacity. According to Scan My Tesla the BMS system reports that the battery original capacity is 82.1 kWh. When we took delivery with 4 miles on the odometer it showed 81.9 kWh as the max capacity. 4 months later we are down to 78.4 kWh as max. Just last week it was 78.9, and the week before that 79.2. For normal driving we charge typically to 60-75% & don't discharge below 35%. Occasionally for long drives we have to charge to 100%, but I try to time the charging with our departure & limit the time parked at 100% after charging is completed to less than 1 hour, often less than 30 mins. Our previous 2016 Model S 90D was down about 14% after 7.5 years & 125k miles. This loss on the Y seems very fast. And considering that right now we are frequently making a trip that requires maximum range due to very limited Superchargers along our route this 3+ kWh (10+ miles) loss has already put us in a bind where we had to reduce our speed to 65 MPH on the interstate so as to not get stranded in a rural area with no Superchargers.